.box {
  position: absolute;
  width: 400px;
  height: 500px;
  border: 1px solid #000;
  left: 40%;
  top: 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.a {
  position: relative;
  width: 100%;
}
